Perhaps you should try some spelling variations:
nam xuat » nam luat, nam xua, pham xuat
va thanh » gia thanh, ban thanh, va tinh
vien hau » vien huu, vien dai, vien da
vien sau » vien dai, vien da, nien su
thi van » thi lan, thi hanh, thi nang
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky nang ((o hoi) or (xa hoi)). thi van nam xuat va thanh ((vien hau) OR (vien sau)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang ((o hoi) OR (xa hoi)). thi van nam xuat va thanh ((vien hau) OR (vien sau)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang ((o hoi) or (xa hoi)). thi van nam xuat va thanh ((vien hau) OR (vien sau)) tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky nang ((o hoi) or (xa hoi)). thi van nam xuat va thanh ((vien hau) OR (vien sau)) tre*.